mirror of
https://github.com/ncblakely/GiantsTools
synced 2024-11-22 22:25:37 +01:00
73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
//--------------------------------------------------------------------------------------
|
|
// File: BinaryReader.h
|
|
//
|
|
// Copyright (c) Microsoft Corporation. All rights reserved.
|
|
// Licensed under the MIT License.
|
|
//
|
|
// http://go.microsoft.com/fwlink/?LinkId=248929
|
|
// http://go.microsoft.com/fwlink/?LinkID=615561
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
#pragma once
|
|
|
|
#include <memory>
|
|
#include <exception>
|
|
#include <stdexcept>
|
|
#include <type_traits>
|
|
|
|
#include "PlatformHelpers.h"
|
|
|
|
|
|
namespace DirectX
|
|
{
|
|
// Helper for reading binary data, either from the filesystem a memory buffer.
|
|
class BinaryReader
|
|
{
|
|
public:
|
|
explicit BinaryReader(_In_z_ wchar_t const* fileName) noexcept(false);
|
|
BinaryReader(_In_reads_bytes_(dataSize) uint8_t const* dataBlob, size_t dataSize) noexcept;
|
|
|
|
BinaryReader(BinaryReader const&) = delete;
|
|
BinaryReader& operator= (BinaryReader const&) = delete;
|
|
|
|
// Reads a single value.
|
|
template<typename T> T const& Read()
|
|
{
|
|
return *ReadArray<T>(1);
|
|
}
|
|
|
|
|
|
// Reads an array of values.
|
|
template<typename T> T const* ReadArray(size_t elementCount)
|
|
{
|
|
static_assert(std::is_pod<T>::value, "Can only read plain-old-data types");
|
|
|
|
uint8_t const* newPos = mPos + sizeof(T) * elementCount;
|
|
|
|
if (newPos < mPos)
|
|
throw std::overflow_error("ReadArray");
|
|
|
|
if (newPos > mEnd)
|
|
throw std::exception("End of file");
|
|
|
|
auto result = reinterpret_cast<T const*>(mPos);
|
|
|
|
mPos = newPos;
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
// Lower level helper reads directly from the filesystem into memory.
|
|
static HRESULT ReadEntireFile(_In_z_ wchar_t const* fileName, _Inout_ std::unique_ptr<uint8_t[]>& data, _Out_ size_t* dataSize);
|
|
|
|
|
|
private:
|
|
// The data currently being read.
|
|
uint8_t const* mPos;
|
|
uint8_t const* mEnd;
|
|
|
|
std::unique_ptr<uint8_t[]> mOwnedData;
|
|
};
|
|
}
|